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Measuring tree volume

Measuring tree volume. How much wood is in that tree? How much is that tree worth?. Tools Needed. Clinometer – used to measure the height of the tree Tape measure – used to measure the diameter and distance from the tree Calculator – used to calculate the board footage in a tree

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Measuring tree volume

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  1. Measuring tree volume How much wood is in that tree? How much is that tree worth?

  2. Tools Needed • Clinometer – used to measure the height of the tree • Tape measure – used to measure the diameter and distance from the tree • Calculator – used to calculate the board footage in a tree • Log Sheet – used to log in all the measurments we take in the field

  3. Using the Clinometer • A Clinometer is a tool used to measure angle and will be used to figure out the height of the tree. It has degrees to measure the angle

  4. Tape Measure • When measuring the diameter, measure in total inches and then divide by 12 to give your dimension in feet. 37 inches in diameter will be = 3.08 ft 37/12 or 3.08 ft

  5. Calculator • A simple calculator will work fine for this exercise. We will be using a table of information for you to make simple calculations.

  6. Log Sheet • The only way to keep track of the trees we measure is to log all the information. • Board Footage Data Sheet • Tree # _____Tree species: ___________________ • Height _____ feet • Diameter _____ inches • Diameter in feet / 2 = ________ radius in inches / 12 = _____ feet • Area of tree cross-section = above number squared x 3.14 =______ sq.ft. • Volume of tree in cubic feet = above number x tree height / 4 = ______ • Volume of tree in board feet = above number x 12 = _________ • What the tree is worth in material= above number x BF cost ____________

  7. Measuring the Height of the Tree By using the formula ab x Tangent A = X, we can determine the height of the tree, where: ab = the distance from the tree A = the angle of elevation X = the height of the tree Tangents are determined by using tangent charts (See the chart )

  8. Tree height samples • Example 1: • if A = 35 feet, and B = 34°, then the tangent of B = 0.6745 • 35 x 0.6745 = X • 23.61 = X (the height is approximately 24 feet, or 7.3 m)

  9. Tree height samples • Example 2: • if a = 35 feet and b = 60°, then the tangent of A = 1.7321 • 35 x 1.7321 = X • 60.6235 = X (the height is approximately 61 feet, or 18.6 m)

  10. Measuring the tree • To measure volume of the tree, 5’ above the ground measure the diameter of tree. • To get the volume • Diameter is equal to Circumference / 3.14 Example : Circumference = 28” that is 28/12 = 2.33 feet 2.33’/3.14 = .75’

  11. Getting the volume • After we get the diameter we need to find the area of the tree • Diameter/2 to get your radius • Area = 3.14 x r2 • Our area in the previous example was .75 • .75/2 = .375 • .3752 x 3.14 = .44

  12. Almost there!!Cubic Area of the tree • Cubic Feet = Area (ft) X Height (ft) / 4 • We found the area in the previous example = .44 Now we multiply .44 x 61’ and divide by 4 WHY divide by 4? It accounts for the taper of the tree Our total cubic feet in our tree is 6.71

  13. Final total • 1 cubic foot has 12 board feet of material in it. • That makes our tree have 6.71 x 12 = • 81 board feet of material in it • It is an oak $3.25 per BF • Our tree is worth • 3.25 x 81 = $263.25

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